Norwich Crown Court was shown CCTV footage of Craig Warmer, 22, stooping down to lift up a girl’s skirt and then filming it at Boots in Castle Mall, Norwich.

The court heard that Warmer had lifted another girl’s skirt outside City College Norwich, and had sexually assaulted a woman he followed in Dereham.

Warmer, of Hyde Road, Dereham, appeared at Norwich Crown Court for sentencing, after pleading guilty at an earlier hearing to two counts of outraging public decency and one count of sexual assault.

He was handed a community order with three years’ supervision and the requirement to attend the Thames Valley sex offender group work treatment programme. A sexual offences prevention order was also made for three years, and he was placed on the sexual offenders’ register for the same amount of time.

Prosecutor, Christopher Morgan said the first offence took place in Dereham on November 27 last year. “Warmer started walking behind a young woman before grabbing her buttock hard in Sandy Lane,” he said. She took a photograph of his back, and DNA from her coat matched Warmer’s.

The next two offences took place while he was on bail. A girl was walking to City College from Castle Meadow on January 30.

As she got to the college gate she was aware that her skirt was being lifted up, so she tried to put it down. The man lifted it up again and he kept hold of it.

The last incident took place in Boots on February 2. Mr Morgan said: “The defendant was seen on CCTV to lift up a girl’s skirt in the aisle, and then film it on his iPhone.” The girl was aged 14 or 15.

Jonathan Morgans, for Warmer, said he had strong family support. He said his “bizarre deviancies” showed he had no control of his desires, but added he wanted to make sure it did not happen again.